Is there a way of creating a constantly changing alphabet between a-z to appear

something like this but for alphabets:

<p id="result"></p> // this is code for random num gen ,I need something like this for alphabet.
    <script>
      var intrvl = setInterval(numbFunction, 500); //repeat function after 1.5 seconds(1500 ms)

      function numbFunction() {
        var x = Math.floor(Math.random() * 10 + 1); //return a random no. between 1 to 10
        document.getElementById("result").innerHTML = x;
      }
    </script>